package com.course.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class CharacterEncodingFilter implements Filter
{

	protected String encoding = null;

	public void destroy()
	{
		this.encoding = null;
	}

	public void doFilter( ServletRequest request, ServletResponse response, FilterChain chain ) throws IOException,
			ServletException
	{
		String encoding = this.getEncoding();
		if ( encoding != null )
		{
			response.setCharacterEncoding( encoding );
			request.setCharacterEncoding( encoding );
		}
		
		chain.doFilter( request, response );
	}

	public void init( FilterConfig filterConfig ) throws ServletException
	{
		this.setEncoding( filterConfig.getInitParameter( "encoding" ) );
	}

	protected String getEncoding()
	{
		return encoding;
	}

	protected void setEncoding( String encoding )
	{
		this.encoding = encoding;
	}

}
